DS1992L-F5 datasheet, PDF - EEWORLD Datasheet

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DS1992L-F5: DescriptionSPECIALTY MEMORY CIRCUIT, MEDB2; Categorystorage storage; File Size221KB，17 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1992L-F5 Overview

SPECIALTY MEMORY CIRCUIT, MEDB2

DS1992L-F5 Parametric

Parameter Name	Attribute value
Maker	DALLAS
package instruction	MICRO CAN
Reach Compliance Code	unknown
Is Samacsys	N
Maximum access time	15000 ns
JESD-30 code	O-MRDB-N2
memory density	1024 bit
Memory IC Type	MEMORY CIRCUIT
memory width	8
Number of functions	1
Number of terminals	2
word count	128 words
character code	128
Operating mode	ASYNCHRONOUS
Maximum operating temperature	70 °C
Minimum operating temperature	-40 °C
organize	128X8
Package body material	METAL
Encapsulate equivalent code	BUTTON,.68IN
Package shape	ROUND
Package form	DISK BUTTON
power supply	3/5 V
Certification status	Not Qualified
Maximum supply voltage (Vsup)	6 V
Minimum supply voltage (Vsup)	2.8 V
surface mount	YES
technology	CMOS
Temperature level	OTHER
Terminal form	NO LEAD
Terminal location	RADIAL
Base Number Matches	1

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DS1992/DS1993

1kb/4kb Memory iButton

www.iButton.com

SPECIAL FEATURES

4096 bits of Read/Write Nonvolatile

Memory (DS1993)

1024 bits of Read/Write Nonvolatile

Memory (DS1992)

256-bit Scratchpad Ensures Integrity of Data

Transfer

Memory Partitioned into 256-bit Pages for

Packetizing Data

Data Integrity Assured with Strict

Read/Write Protocols

Operating Temperature Range from -40°C to

+70°C

Over 10 years of data retention

Easily Affixed with Self-Stick Adhesive

Backing, Latched by its Flange, or Locked

with a Ring Pressed onto its Rim

Presence Detector Acknowledges When

Reader First Applies Voltage

Meets UL#913 (4th Edit.); Intrinsically Safe

Apparatus, Approved under Entity Concept

for use in Class I, Division 1, Group A, B, C

and D Locations

F5 MICROCAN

5.89

0.36

0.51

COMMON iButton FEATURES

Unique, Factory-Lasered and Tested 64-bit

Registration Number (8-bit Family Code +

48-bit Serial Number + 8-bit CRC Tester)

Assures Absolute Traceability Because No

Two Parts are Alike

Multidrop Controller for MicroLAN

Digital Identification and Information by

Momentary Contact

Chip-Based Data Carrier Compactly Stores

Information

Data Can be Accessed While Affixed to

Object

Economically Communicates to Bus Master

with a Single Digital Signal at 16.3kbps

Standard 16mm Diameter and 1-Wire

Protocol Ensure Compatibility with iButton

Family

Button Shape is Self-Aligning with Cup-

Shaped Probes

Durable Stainless Steel Case Engraved with

Registration Number Withstands Harsh

Environments

16.25

YYWW REGISTERED

17.35

000000FBD804

GND

All dimensions shown in millimeters.

ORDERING INFORMATION

DS1992L-F5

DS1993L-F5

F5 MicroCan

EXAMPLES OF ACCESSORIES

DS9096P Self-Stick Adhesive Pad

DS9101 Multipurpose Clip

DS9093RA Mounting Lock Ring

DS9093F Snap-In Fob

DS9092 iButton Probe

1-Wire and iButton are registered trademarks of Dallas Semiconductor.

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021604

DS1992/DS1993

iButton DESCRIPTION

The DS1992/DS1993 memory iButtons (hereafter referred to as DS199_) are rugged read/write data

carriers that act as a localized database, easily accessible with minimal hardware. The nonvolatile

memory and optional timekeeping capability offer a simple solution to storing and retrieving vital

information pertaining to the object to which the iButton is attached. Data is transferred serially through

the 1-Wire protocol that requires only a single data lead and a ground return.

The scratchpad is an additional page that acts as a buffer when writing to memory. Data is first written to

the scratchpad where it can be read back. After the data has been verified, a copy scratchpad command

transfers the data to memory. This process ensures data integrity when modifying the memory. A 48-bit

serial number is factory lasered into each DS199_ to provide a guaranteed unique identity that allows for

absolute traceability. The durable MicroCan package is highly resistant to environmental hazards such as

dirt, moisture, and shock. Its compact coin-shaped profile is self-aligning with mating receptacles,

allowing the DS199_ to be easily used by human operators. Accessories permit the DS199_ to be

mounted on almost any surface including plastic key fobs, photo–ID badges, and PC boards.

Applications include access control, work-in-progress tracking, electronic travelers, storage of calibration

constants, and debit tokens.

OPERATION

The DS199_ have three main data components: 1) 64-bit lasered ROM, 2) 256-bit scratchpad, and 3)

1024-bit (DS1992) or 4096-bit (DS1993) SRAM. All data is read and written least significant bit first.

The memory functions are not available until the ROM function protocol has been established. This

protocol is described in the ROM functions flow chart (Figure 9). The master must first provide one of

four ROM function commands: 1) read ROM, 2) match ROM, 3) search ROM, or 4) skip ROM. After a

ROM function sequence has been successfully executed, the memory functions are accessible and the

master can then provide any one of the four memory function commands (Figure 6).

PARASITE POWER

The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry steals power whenever

the data input is high. The data line provides sufficient power as long as the specified timing and voltage

requirements are met. The advantages of parasite power are two-fold: 1) by parasiting off this input,

lithium is conserved, and 2) if the lithium is exhausted for any reason, the ROM can still be read

normally.

64-bit LASERED ROM

Each DS199_ contain a unique ROM code that is 64 bits long. The first 8 bits are a 1-Wire family code.

The next 48 bits are a unique serial number. The last 8 bits are a CRC of the first 56 bits. (See Figure 2.)

The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and XOR gates

as shown in Figure 3. The polynomial is X

+ X

+ 1. Additional information about the Dallas 1-Wire

Cyclic Redundancy Check is available in the Book of DS19xx iButton Standards. The shift register bits

are initialized to zero. Then starting with the least significant bit of the family code, 1 bit at a time is

shifted in. After the 8th bit of the family code has been entered, then the serial number is entered. After

the 48th bit of the serial number has been entered, the shift register contains the CRC value. Shifting in

the 8 bits of CRC should return the shift register to all zeros.

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DS1992/DS1993

MEMORY

The memory map in Figure 4 shows a 32-Byte page called the scratchpad, and additional 32-Byte pages

called memory. The DS1992 contains pages 0 though 3 that make up the 1024-bit SRAM. The DS1993

contain pages 0 through 15 that make up the 4096-bit SRAM.

The scratchpad is an additional page that acts as a buffer when writing to memory. Data is first written to

the scratchpad where it can be read back. After the data has been verified, a copy scratchpad command

transfers the data to memory. This process ensures data integrity when modifying the memory.

MEMORY FUNCTION COMMANDS

The Memory Function Flow Chart (Figure 6) describes the protocols necessary for accessing the memory.

An example follows the flow chart. Three address registers are provided as shown in Figure 5. The first

two registers represent a 16-bit target address (TA1, TA2). The third register is the ending offset/data

status byte (E/S).

The target address points to a unique Byte location in memory. The first 5 bits of the target address

(T4:T0) represent the Byte offset within a page. This Byte offset points to one of 32 possible Byte

locations within a given page. For instance, 00000b points to the first Byte of a page where as 11111b

would point to the last Byte of a page.

The third register (E/S) is a read only register. The first 5 bits (E4: E0) of this register are called the

ending offset. The ending offset is a Byte offset within a page (1 of 32 Bytes). Bit 5 (PF) is the partial

Byte flag. Bit 6 (OF) is the overflow flag. Bit 7 (AA) is the authorization accepted flag.

Figure 5. ADDRESS REGISTERS

TARGET ADDRESS (TA1)

TARGET ADDRESS (TA2)

ENDING ADDRESS WITH

DATA STATUS (E/S)

(READ ONLY)

T15

T14

T13

T12

T11

T10

Write Scratchpad Command [0Fh]

After issuing the write scratchpad command, the user must first provide the 2-Byte target address,

followed by the data to be written to the scratchpad. The data is written to the scratchpad starting at the

byte offset (T4:T0). The ending offset (E4:E0) is the Byte offset at which the host stops writing data. The

maximum ending offset is 11111b (31d). If the host attempts to write data past this maximum offset, the

overflow flag (OF) is set and the remaining data is ignored. If the user writes an incomplete Byte and an

overflow has not occurred, the partial Byte flag (PF) is set.

Read Scratchpad Command [AAh]

This command can be used to verify scratchpad data and target address. After issuing the read scratchpad

command, the user can begin reading. The first two Bytes are the target address. The next Byte is the

ending offset/data status Byte (E/S) followed by the scratchpad data beginning at the Byte offset (T4: T0).

The user can read data until the end of the scratchpad, after which the data read is all logic 1’s.

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DS1992L-F5 Related Products

	DS1992L-F5	DS1992	DS1993L-F5
Description	SPECIALTY MEMORY CIRCUIT, MEDB2	1kb/4kb Memory iButton	SPECIALTY MEMORY CIRCUIT, MEDB2
Maker	DALLAS	DALLAS	DALLAS
Reach Compliance Code	unknown	unknown	unknown
Is Samacsys	N	N	N
Base Number Matches	1	1	1
package instruction	MICRO CAN	-	MICRO CAN
Maximum access time	15000 ns	-	15000 ns
JESD-30 code	O-MRDB-N2	-	O-MRDB-N2
memory density	1024 bit	-	4096 bit
Memory IC Type	MEMORY CIRCUIT	-	MEMORY CIRCUIT
memory width	8	-	8
Number of functions	1	-	1
Number of terminals	2	-	2
word count	128 words	-	512 words
character code	128	-	512
Operating mode	ASYNCHRONOUS	-	ASYNCHRONOUS
Maximum operating temperature	70 °C	-	70 °C
Minimum operating temperature	-40 °C	-	-40 °C
organize	128X8	-	512X8
Package body material	METAL	-	METAL
Encapsulate equivalent code	BUTTON,.68IN	-	BUTTON,.68IN
Package shape	ROUND	-	ROUND
Package form	DISK BUTTON	-	DISK BUTTON
power supply	3/5 V	-	3/5 V
Certification status	Not Qualified	-	Not Qualified
Maximum supply voltage (Vsup)	6 V	-	6 V
Minimum supply voltage (Vsup)	2.8 V	-	2.8 V
surface mount	YES	-	YES
technology	CMOS	-	CMOS
Temperature level	OTHER	-	OTHER
Terminal form	NO LEAD	-	NO LEAD
Terminal location	RADIAL	-	RADIAL

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